S.C. Code § 18-9-210
An undertaking upon an appeal shall be of no effect, unless it be accompanied by the affidavit of the sureties that they are each worth double the amount specified therein. The respondent may, however, except to the sufficiency of the sureties within ten days after receipt of the notice of appeal; and unless they or other sureties justify before a judge or clerk of the court below, as prescribed by Sections 15-17-270 and 15-17-280, within ten days thereafter, the appeal shall be regarded as if no undertaking had been given. The justification shall be upon notice of not less than five days. No clerk shall take the justification of any surety or sureties in a case in which he may be interested or when either of the parties or such surety or sureties shall be connected with him by affinity or consanguinity within the sixth degree, and in all cases in which the clerk may have approved or disapproved of the sufficiency of a surety or sureties his action may be reviewed, on motion, after notice before a circuit judge. And in case at any time in any action a respondent shall be of opinion that the surety or sureties on any bond already approved are insufficient and shall make affidavit of the fact, setting out the grounds of such belief and serving a copy thereof upon appellant's attorney, then the sureties or other sureties shall justify anew thereon in the same manner and with the same effect as though such new justification were an original justification on such bond.
S.C. Code § 18-9-210